CC-2753: Ability to disable stream 1 but still show it in the interface

- interface change
- all elements becomes 'disabled' depending on 'disable_stream_conf' flag

airtime_mvc/application/controllers/PreferenceController.php

@@ -188,6 +188,7 @@ class PreferenceController extends Zend_Controller_Action
             }
         }
         $this->view->num_stream = $num_of_stream;
+        $this->view->disable_stream_conf = Application_Model_Preference::GetDisableStreamConf();
         $this->view->form = $form;
     }